Abstract:Slope collapse is one of the most common geological disasters,which is controlled by multi-factors. The mechanism of slope stability is very complicated,it is thus essential to study the method of theoretical calculation and numerical simulation. With the development of modern science and technology,especially some advanced numerical simulation technologies,it becomes possible to build up a viable 3D mine model and then provides a new analysis method for slope stability. The basic principles and steps followed in the 3D numerical simulating process based on MapGIS,Surpac and AutoCAD are clearly introduced. The obtained numerical model will possess all kinds of information including the mechanical characteristics of materials and the geometrical parameters of geological discontinuities known from previous works. Both the whole geological structure and various geological components involved in a slope can be visualized on computer;the complicated analysis and calculation can be then carried out more effectively. The combination of 3D numerical model with some classical theories in slope stabilization can easily provide the stability factor,and the combination with other powerful finite element methods can realize more complicated calculation and offer more detailed results of stress and displacement. A case study,Luoshan Mine slope in Lingbao of Henan Province,is discussed. The stability coefficient in certain key cross-sections of slope is obtained,which can be useful in the slope stability studies.